Finance Co-Op applicants have rated the interview process at Wayfair with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 51.5% positive. This is according to Glassdoor user ratings.
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The behavioral based interview. After that, the Excel part which is about pivot tables, not the hard part. However, I would recommend to get some preparation, and get your hand on conditional formatting & pivot tables